Create identifiers index on pm_advisories

Yasha Riserequested to merge
499408-create-index_pm_advisories_on_identifiers into master

What does this MR do and why?

Create an index to support the query implemented in Reimplement "Expose CVSS, KEV and EPSS score to... (!175056 - closed).

The index is created in a separate MR following the documentation.

Database Review

Creating the index in a postgres.ai prod instance clone yields:

gitlabhq_dblab=# CREATE INDEX CONCURRENTLY index_pm_advisories_on_identifiers ON pm_advisories USING gin (identifiers);
CREATE INDEX
Time: 2351.826 ms (00:02.352)

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Related to #499408 (closed)

Edited by Yasha Rise

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